Feeding mechanism for sewing machines



y 1942 F. F. ZEIER 2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 1939 4 sht sh t 1 redere jeier July 28, 1942. ZE|ER 2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 19:59 4Sheets sheet 2 awe/whom $7 edem'ek @jeiev July 28, 1942; ZE|ER 2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 1939 4Sheets-Sheet 3 arvucwvtcvv @Pedem'e jez'er July 28, 1942. ZE|ER2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 1959 4Sheets-Sheet 4 aux 00mm rederclg 6258i Patented July 28, 1942 FEEDINGMECHANISM FOR SEWING. MACHINES Frederick F. Zeier, Fairfleld. Connasaignor to,

The Singer Manufacturin g Company, Elizabeth, N. J., a corporation ofNew Jersey Original application April 15, 1939, Serial a... 267,958.Divided and this application April 30, 1940, Serial No. 332,441

12 Claims. (Gl. 112-207) This invention relates to sewing machines ofthe straightaway feed type and it has for its primary object theprovision of an improved workfeeding mechanism designed and actuated sothat the superimposed plies of material are each fed through the sewingmachine at the same rate and without any relative movement of the pliesof material during the feeding thereof.

Another object of the invention is to provide a feeding mechanism of theabove type wherein the feed-bar supporting the usual-feed-dog and theDresser-bar supporting the usual presserfoot are actuated by connectionsdesigned and arranged to eliminate side-thrusts between the feed-bar andpresser-bar in their respective bearings, thereby enabling the feedingmechanism to be operated at a comparatively high rate of speed.

With these and other objects in view which will more fully appear, thenature of the invention will be more clearly understood byfollowing thedescription, the appended claims, and the several views illustrated inthe accompanying drawings.

In the drawings:

Fig. 1 is a front side elevation of a. sewing main a head 4. Journaledin suitable'bearings in the bracket-arm 3 is a rotary mainor arm-shaft 5having fastened thereon'at one end a counterbalanced crank 6 connectedby a link I to a reciprocatory needle-bar 8 carrying at its lower end aneye-pointed needle 9. At the standardend of the machine the arm 'shaft 5has secured thereto a balance-wheel I having formed therein a,belt-groove ll adapted to receive a belt (not shown) actuated by anysuitable power source.

Jcurnaled in bearings in the bed I is a rotary bed-shaft l2 connected tobe rotated at a oneto-one ratio from the arm-shaft by a conventionalclip-belt l3 operating within a belt-compartment M in the standard 2.Adjacent the head-end of the machine, the rotary bed-shaft i2 isconnected by a suitable linkage to a. chainstltch looper l5 which is ofthe threaded twomotion type and is adapted to be oscillated in avertical plane parallel to the direction of feed, the loop-seizingmotion being in a direction opposite to the direction of feed of thework through chine embodying the invention, with portions of thebracket-arm and bed in section to show the internal mechanism.

Fig. 2 is a rear side elevation of the sewing machine.

Fig. 3 is a front end elevation of the sewing machine with the bed, insection.

Fig. 4 represents a vertical sectiontaken substantially along the lineM, Fig. 3.

Fig. 5 is a detail view in elevation of the reedframe in which arejournaled the reciprocatory needle-bar and the feed-bar. I

Fig. 6 is a top plan sectional view of the frontend portion of thebracket-arm, illustrating the internal mechanism.

Fig. 7 represents a horizontal section through the head of the machinetaken substantially along the line Ii, Fig. 3.

h This application is a division of my copending application Serial No.267,958, filed April 15, 1939.

The general constructive features of the sewing machine chosen forillustration of the present improvement are described in detail in theabove mentioned pending application, and in this application only suchreference will be made to the various elements of the machine as willassist in'a. clear understanding of the present invention.

The sewing machine comprises a frame having a bed i from one end ofwhich rises a standard the machine. The looper actuating linkage isfully illustrated and described in my copending application abovereferred to and, therefor, need not be described further herein. Toassist in stitch-formation, the two-motion looper l5 has cooperatingtherewith a spreader i8 which is adapted to engage one limb of thelooper-threadloop on the looper to distend the same and form the usualthread-triangle with the previous needle-thread-loop which is about theblade of the looper for entrance by the descending needle 9. Thespreader it is reciprocated horizontally crosswise of the vertical planeof movement of the looper it by a supporting shaft l'i (Fig. i) endwisemovable in its bearing-bushing it through connections operated by aneccentric to fixed to rotate with the bed-shaft i2.

Located beneath the cloth-plate 20 on the bed i is preferably a lowerfour-motion feeding mechanism which operates in synchronism with thetop-feed later to be described. This four-motion feed (Fig. 3)preferably comprises a feed-advance and -return rock-shaft 2i and afeed-lift rockshaft 22 disposed on opposite sides of the bedshaft l2.shaft 2! is joumaledin suitable bushings in the machine-bed i and hasclamped upon the inner end thereof a depending rock-lever 23, the lowerend of which is connected by a pitman 2am an,

- adjustable eccentric 25 upon the bed-shaft i2.

2 of an overhanging bracket-arm 3 terminating The elements of theeccentric 25 are identical with the eccentric disclosed in the UnitedStates patent to W. Myers, No. 2,128,031, dated Aug. 23,

The feed-advance and -retum rock 1938. Secured by screws 28 upon theouter endportion of the rock-shaft 2| is the usual upstandingfeed-rocker 21 carrying at its upper end a hollow fulcrum-bar 28 heldagainst endwise displacement by the cap-screws 28 threaded into thefeed-rocker 21. Journaled upon the fulcrumbar 28 is the bifurcated endof a feed-bar 88 formed with a guideway 3| (Fig. 3) entered by the shankof the lower feed-dog 82. Formed in the feed-dog 82 is a needle-aperture88 which is adapted to receive the needle 8 and back up the same duringfeeding of the work.

The feed-lift rock-shaft 22 is supported at its opposite ends bysuitable pintles fixed in the bed I. Depending from the inner end of thefeed-lift rock-shaft 22 is a rock-lever 34 whose lower end is connectedby a short pitman 88 actuated by an eccentric 38 fastened upon thebed-shaft I2. Extending horizontally and forwardly from theouter end ofthe feed-lift rock-shaft 22 is a rocklever 31 (Fig. 3), the free end ofwhich is connected by the parallel depending links 88 to the free end ofthe feed-bar II.

It will be understood from the above description that the feed-dog 82has imparted to it the usual four motions necessary to feed the workthrough the machine, and that the extent of the feed-advance of the workper needle reciprocation can be controlled by the adjustable eccen trio2!.

Referring now to the mechanism above the bed I and within thebracket-arm 8 and head 4, the needle-bar 8 is journaled for endwisereciprocation in the two spaced lugs 38 and 48 formed on a vibratoryframe 4I pivotally hung at its upper end upon a stud 42 secured byscrews 48 in the top of the head 4. i The lower end of the vibratoryframe 4I is steadied in its movement in the line of feed by an L-shapedbracket 44 which is secured by screws 45 to the machine-head 4. Theneedle 8 is adapted to be vibrated in the line of feed in timed relationwith the various feeding elements, and to this end there is provided onthe arm- 'shaft 5 an adjustable eccentric 48 connected to the vibratoryframe 4| by means clearly disclosed in Figs. 2, 3 and 6. Referringparticularly to Figs. 2 and 6, it will be observed that embracing theeccentric 48 is a short rearwardly extending pitmanilconnected to theupper end of a vertically disposed rock-lever 48 clamped at its lowerend upon the end of a feed-advance rockshaft 48 journaled in spaced lugs88 on the rear wall of the head 4. Pinned upon the other end of therock-shaft 48 is the upper end of the depending rock-lever 8| connectedat its lower end by a horizontal link 82 to a split projection ll, seeFig. 5, formed upon the vibratory frame 4 I.

To provide for changing the amplitude of vibration of the needle, 1. e.,to change the length of stitch, provision must be made to permitadjustment of the amount of vibratory movement imparted to the needle.In the present case, the eccentric is constructed so thatitseccentricity may be conveniently adjusted laterally of the arm-shaft5 to give the desired stitch-length. To assist in effecting adjustmentof the eccentric 48, there is provided in the top of the bracketarm 8 adetent 84 which is adapted to be depressed by the operator and to entera suitable stop-notch in the adjusting member of the eccentric 48,permitting the operator to turn the balance-wheel I8 and adjust theeccentricity of the eccentric. For a complete disclosure of the detent84, reference may be had to the U. 8. petent to W. Myers, No. 2,063,264,dated Dec. 8, 1936.

In a machine having an upper feeding mechanism and a lower feedingmechanism, each deriving its work-advancing movements from independentadjustable eccentrics, means must be provided to enable the two feedingmechanisms to remain in unison during the adjustment of thestitch-length. The means employed in the present machine is identicalwith that shown and described in my copending application, Serial No.267,958, of which this is a division, and for a detailed description ofsuch means reference may be had to the above mentioned pendingapplication.

Considering now the upper four-motion feeding mechanism which assiststhe needle in advancing the work and is designed to cooperate with thepresser-mechanism, the upper feeding mechanism comprises a feed-dog 88carried in the usual way upon the lower end of a feed-bar 88 slidable ina vertical dovetailed guideway ll formed in the vibratory frame 4|. FromFigs. 4 and 5, It will be observed that in order to take up wear, andalso to facilitate manufacture, one side of the dovetailed guideway 81is in the form of a detachable gib 88 secured by screws 88 threaded intothe vibratory frame 4 I.

Disposed adjacent the feed-dog 88 is a presserfoot 88 attached to thelower end of an endwise movable presser-bar 8| journaled in a fixedbushing in the head 4 of the machine. Clamped upon the upper end of thepresser-bar 8| is a horizontal guide-arm 82, Fig. 7, the free end orwhich is adapted to enter the usual presser-bar guideslot 88 provided inthe rear wall of the machinehead 4. This guide-slot 88, in the presentcase. is preferably formed of two parallel hardened steel runners 84 and88 secured one upon the outside of the wall of the machine-head 4 andthe other upon the inside of the wall of the machine- 'head by screws 88and 81.

' upper end of the feed-bar 88, and the pin II is connected by adepending link 18 to a lifting pin 14 carried by the presser-barguide-arm 82. The upstanding limb of the angle-lever 88 is connected bythe curved link 18 to the slotted rocklever I8 pinned upon one end of afeed-lift rockshaft 'I'I journaled in a lug I8 integral with the rearwall of the machine-head 4. Clamped upon the other end of the feed-11ftrock-shaft I1 is the upstanding rock-lever I8, the upper end of which isconnected by a pitman 88 actuated by an eccentric 8| secured upon thearm-shaft 8.

Referring to Figs. 3 and 6, it will be seen that the free end of the arm88' provides a floating fulcrum for the inverted T-shaped angle-lever88, and that its turning movements are about the axis of the rock-shaft48 upon which it is freely journaled. The provision of the floatingfulcrum for the angle-lever 88 in combination with the two links I2 andI8 connecting the anglelever to the upper ends of the feed-bar 88 andpresser-bar 8| makes toward a top-feed mechanism wherein the necessaryactuating movements may be transmitted to the respective elementswithout undue binding or side-thrust between the feed-bar 58 and thepresser-bar M with their respective bearing surfaces. The elimination ofthis reaction permits the operation of the topfeed at a higher rate ofspeed with a minimum of spring-pressure. The arm 89 and the mechanismconnected thereto are depressed into contact with the work preferably bya leaf-spring 82 of which the innerv end projects through a clearanceopening I!" in the head 4. This inner end is slightly concaved andengages the semispherical head of the screw t8 projecting up wardly fromthe free end of the'arm 69'. The

other end of the leaf-spring I2 is apertured to receive the retainingpin it of the lug 85, and intermediate the ends of the leaf-spring thereis provided an adjusting screw 86 for regulating the amount of pressureapplied by the spring.

Considering the top feeding mechanism in the position illustrated inFig. 3, the operation thereof is as follows: Rotation of the arm-shaft iimparts to the angle-lever 88, through the eccentric ti and theconnections actuated thereby, a constant oscillatory motion about theaxis of the fulcrumpin 69. when the presser-foot OI engages. the workerthe throat-plate as shown in Fig. 3, and the rock-lever I8 moves in aclockwise direction about the axis of the feed-lift rock-shaft II, thepin II. of the angle-lever I becomes the pivotpoint about which theangle-lever turns. Further movement of the rock-lever It in the samedirection (clockwise) raises the feed-bar 58 through the link I2 andalso elevates to a small extent the spring-biased end of the arm 89'.When the feeddog 55 carried by the feed-bar 58 is thus lifted from thework, the needle 9 also being out of the work, the vibratory frame ll,which, carries the needle-bar 8 and the feed-bar 56, is shifted to theright through vibration of the rock-lever ll Fig. 3, or, in other words,given its feed-retum movement. At the end of this feed-return movement,the oscillation of the rock-lever I5 in a counterclockwise directioncauses a turning of the angle-lever 68 about the pivot-pin 89 in aclockwise direction, which results in a lowering of the feed-dog 55 intocontact with the work. in which position the pin 'Ili carried by theangle-lever 88 becomes the pivot-point about which the anglelever turns.Further movement of the rock-lever I8 in the counterclockwise directionraises the presser-bar 6] through the link I3. When the presser-foot isthus raised from the work, the vibratory frame I carrying the needle-bar8 and the feed-bar 56 has imparted to it, through its actuatingconnections previously described, the feed-advance movement. In themachine chosen for illustration, this sequence of operations is repeatedin timed relation with the lower fourmotion feed previously described.In order that the amount of elevation of the presser-foot and feed-dogmay be varied to compensate for the different thicknesses of materialssewn, the rock-lever It is slotted, as at It, and has adjustably clampedthereto the curved link I5. Adjustment of the end of the link I5 in theslot It varies the amount of oscillation imparted to the angle-lever 68which controls the height to which the presser-foot 66 and feed-dog 55are raised.

From Figs. 1 and 3, it will be seen that in order to obtain acomparatively long stitch, the feed: bar 56 is spaced to the left of thevertical plane containing the longitudinal axes of the needlebar 8 andthe presser-bar SI, and also rearwardly of the needle-bar 8 so that thefeed-bar 5t can k 3 move ackwardly during the feed stroke to a positiosubstantially at the side of the presserbar 8|. With the view ofobtaining a more smoothly acting top feeding mechanism, and to minimizethe endwise movement of the feed-bar 56 in its bearings 89 and 40 duringthe vibration of the. frame II, the axis of the stud 42 upon whichtheframe is pivotally hung is in a plane which lies substantially midwaybetween-the longitudinal axes of the feed-bar 56 and the needlebar 8,see Fig. 3.

From the above description, it will be understood that I have invented atop feeding mechanism which. in its operation, is exceedingly flexibleand capable of a high speed of operation. Moreover, since only arelatively smallspring pressure is required to maintain the presser-footor feed-dog in contact with the upper surface of the work, the top-feedmay be operated at a high speed without the excessive pounding of thefeeddog or presser-foot on the work-support, which heretofore has beenpresent in other top feeding mechanisms. While in the present disclosurethe top-feedis shown in combination with a lower four-motion feed. it isto lie-understood that the top-feed may be used by itself or with anyother type of lower feed, such as a wheeli'eed or a puller-feed.

The presser-foot 60 and the top feed-dog 55 are adapted to be raisedeither by the usual handcontrolled lifting lever or by kneeorfoot-operated mechanism. The preferred form of handcontrolled liftinglever comprises a rearwardly extending lever 81 provided with a handle88 at its free end, and at its other end with a relatively long hub 89formed with a lifting cam 90. As the lever 81 is raised, the lifting cam90 engages under the presser-bar guide-arm 62 which is clamped upon thepresser-bar 6|, thereby elevating the presser-footfrom the work. Theraising of the presser-bar guide-arm 62 transmits a lifting forcethrough the link It and the anglelever 68 of the top feeding mechanismto the free end of the arm 69', which causes the same to turn in acounterclockwise direction about the rock-shaft 49 in opposition to theleaf-spring 82. The turning of the arm 69' in a counterclockwisedirection obviously elevates the top feed-bar 58 which is connected tothe arm 69' through the link I2 and the angle-lever 68. From the aboveit will be understood that a raising of the lever 81 will elevate boththe presser-foot 60 and the feed-dog 55.

The presser-bar guide-arm 62 is clamped upon the upper end of thepresser-bar Si by a lifting pin I4, the inner end of which is receivedin a vertically disposed clearance slot 9i formed in the lower end of alink 92 connected at its upper end to the horizontal arm '93 of abell-crank lever pivoted upon a fulcrum-stud 9t projecting from the rearwall of the machine-head 4. Fastened upon the upstanding arm 95, whichforms the other limb of the bell-crank lever, is a comparatively longwire link 95 secured at its other end to a second bell-crank lever 97connected by a chain 98 to a common form of knee-shift or treadle.device.

The hand-controlled lifting lever 81 can be actuated independently ofthe kneeor footoperated mechanism for a major portion of its arc ofmovement by virtue of the clearance slot 9| formed in the link 92. Itwill be appreciated that a raising of the hand-controlled lever 81 theclearance slot, without imparting any movement to the knecorfoot-operated mechanism until the pin engages the upper end of the slot9|. In order to maintain the link 02 in its lowest position, the arm IIof the bell-crank lever has bearing against it a spring I. which iscoiled about and secured to the fulcrum-stud, ll of the bell-cranklever.

Having thus set forth the nature of the invention, what I claim hereinis:

1. In combination. in a sewing machine having a frame including awork-support; a reciprocatory presser-foot carrying bar; a feeding-footcarrying bar mounted for endwise reciprocatory and laterally vibratorywork-feeding movements; a fulcrum-arm having a free end; a leverpivotally mounted upon the free end of said arm; means for oscillatingsaid lever; a link connecting said lever with said presser-foot carryingbar; a second link connecting said lever with said feeding-foot carryingbar; and spring means eiIective for yieldinglyurging said presser-footcarrying .bar and said feeding-foot carrying bar toward saidwork-support.

2. In combination, in a sewing machine having a frame including awork-support; a reciprocatory presser-foot carrying bar; a feeding-footcarrying bar mounted for endwise reciprocatory and laterally vibratorywork-feeding movements; an oscillatory lever; a freely turnablefulcrumarm pivotally supporting said oscillatory lever and providing afloating fulcrum therefor; means for oscillating said lever; means forconnecting said oscillatory lever to said presser-foot carrying bar andto said feeding-foot carrying bar; and spring means acting upon saidoscillatory lever for yieldingly urging said presser-foot carrying barand said feeding-foot carrying bar toward said work-support.

3. In combination, in a sewing machine having a frame including awork-support and a bracketarm; a reciprocatory presser-foot carrying barjournaled in said bracket-arm; a vibratory frame pivoted upon saidbracket-arm; an endwise reciprocatory needle-bar journaled in said vibratory frame; a feeding-foot carrying bar also iournaled in said vibratoryframe; means for alternately raising and lowering said pres'ser-footcarryingbar and said feeding-foot carrying. bar including anoscillatable lever; means providing a floating fulcrum independent ofsaid presserfoot carrying bar for said oscillatable lever; and means foryieldingly urging said presser-foot carrying bar and said feeding-footcarrying bar toward said work-support.

4. In combination, in asewing machine having a frame including awork-support; a reciprocatory' presser-foot carrying bar; a feeding footcarrying bar mounted for endwise reciprocatory and laterally vibratorywork-feeding movements; a plural-armed lever;means for oscillating saidplural-armed lever; a freely turnable fulcrumarm pivotally supportingsaid plural-armed lever at the Junction of its arms and providing afloating fulcrum therefor; a link connecting one of the arms of saidlever with said presser-foot carrying bar; a second link connectinganother of the arms of said lever with said feeding-foot carrying bar;and a spring adapted to apply a downward pressure upon said plural-armedlever at substantially the Junction of its arms for yieldingly urgingsaid presser-foot carrying bar I and said feeding-foot carrying bartoward sa work-support.

5. The combination in a sewing machine having a frame including awork-support; a reciprocatory presser-foot carrying bar; a feedingfootcarrying bar mounted for endwise reciprocatory and laterally vibratorywork-feeding movements; an oscillatory lever; means independent of saidpreser-foot carrying bar for pivotally supporting said lever; means foroscillating said lever about its supportingpivot; a link connecting saidlever with said presser-foot carrying bar; a second link connecting saidlever with said feeding-foot carrying bar; and spring means effective toyielding y urge said presser-foot carrying bar and said feeding-footcarrying bar toward said work-support.

8. The combination in a sewing machine having a frame including awork-support and a bracket-arm; a reciprocatory presser-foot carryingbar; a feeding-foot carrying bar mounted for endwise reciprocatory andlaterally vibratory work-feeding movements; a rock-shaft journaled insaid bracket-arm; means for actuating saidrock-shaft; a fulcrum-armfreely iournaled upon said rock-shaft and pivotally supporting at itsfree end an oscillatory lever; means for actuating said ouillatory leverabout its supporting pivot; means connecting said oscillatory lever withthe respective upper ends of thepresserfoot carrying bar and thefeeding-foot carrying bar; and spring means eifective to yieldingly biassaid presser-foot ca ryin bar and said feedingfoot carrying bar towardsaid work-support.

7. The combination in a sewing machine having a frame including awork-support and a bracket-arm; an actuating shaft Journaled in saidbracket-arm; a reciprocatory presser-foot carrying bar; a feeding-footcarrying bar mounted for endwise reciprocatory and laterally vibratorywork-feeding movements; a feed-advance rock-shaft journaled in saidbracket-arm and actuated by an eccentric on said actuating shaft; meansoperatively connecting said feed-advance rock-shaft to vibrate laterallythe feeding-foot carrying bar; a fulcrum-arm freely iournaled on saidfeed-advance rock-shaft and pivotally supporting at its free end anoscillatory lever; means for actuating said oscillatory lever about itssupporting pivot; means connecting said oscillatory lever with therespective upper ends of the presser-foot c rrying bar and thefeedingfoot carrying bar; and spring means effective to yieldingly biassaid presser-foot carrying bar and said feeding-foot carrying bar towardsaid work-support.

8. In a sewing machine, the combination with a frame including awork-support and a bracketan actuating shaft journaled in saidbracket-arm; a feed-advance rock-shaft Journaled in said bracket-arm atone side of the vertical plane containing the longitudinal axis of saidactuating shaft and operated by an eccentric on said last mentionedshaft; an endwise reciprocatory presser-foot carrying'bar; an endwisereciprocatory and a laterally vibratory feeding-foot ca yin bar; meansoperatively connecting said feed-advance rock-shaft to vibrate saidfeeding-foot carrying bar in the line of feed; a fulcrum-arm freelyjournaled upon said feedadvance rock-shaft and pivotally supporting atits free end an oscillatory lever; a feed-lift rockshaft spaced fromsaid feed-advance rock-shaft andoperated by a second eccentric on saidactuating-shaft; means connecting said feed-lift rock-shaft to turn saidoscillatory lever about its supporting pivot; links connecting saidoscillatory lever to the respective upper ends of the presser-footcarrying bar and the feeding-foot carrying bar; and a spring eflectiveto yieldingly bias said presser-foot carrying bar and said feeding-footcarrying bar toward said work-support.

9. A sewing machine having, in combination, a frame including awork-support and an overhanging bracket-arm; a reciprocatory presserfootcarrying bar joumaled in said bracket-arm; a vibratory frame pivotallyhung at its upper end upon said bracket-arm; a needle-bar and afeeding-foot carrying bar each joumaled for endwise reciprocatorymovements in said vibratory frame, and each spaced a substantially equaldistance from a vertical plane passing through the point of pivotalsupport of said vibratory frame; means for actuating said vibratoryframe in the line of feed; means for alternately raising and loweringsaid presser-foot carrying bar and said feedingfoot carrying barincluding an oscillatable lever; means including a freely fulcrumed armproviding a floating fulcrum for said oscillatable lever; and springmeans engaging said freely'fulcrumed arm for yieldingly urging saidpresser-foot carrying bar and said feeding-foot carrying bar toward saidwork-support.

10. A sewing machine having, in combination, a frame including awork-support and an overhanging head provided with a clearance openingtherein; a reciprocatory presser-foot carrying bar; a feeding-footcarrying bar mounted for endwise reciprocatory and laterally vibratorywork-feeding movements; an oscillatory lever disposed above the upperends of said presserfoot carrying bar and said feeding-foot carryingbar; a freely turnable fulcrum-arm pivotally supporting said oscillatorylever and providing a floating fulcrum therefor; means for oscillatingsaid lever; links for connecting said oscillatory lever to saidpresser-foot carrying bar and to said feeding-foot carrying bar; and aleaf-spring extending through the clearance opening in said overhanginghead and acting upon said oscillatory lever for yieldlngly urging saidpresserfoot carrying bar and said feeding-foot carrying bar toward saidwork-support.

11. The combination in a sewing machine having a frame including awork--support and a bracket-arm terminating in a head; a reciprocatorypresser-foot carrying bar; a feeding-foot carrying bar mounted forendwise reciprocatory and laterally vibratory work-feeding movements; asubstantially horizontally disposed fulcrumarm pivotally sustained bysaid bracket-annhead; an oscillatable lever journaled for turningmovements on said horizontally disposed fulcrumarm; means foroscillating said lever; means connecting said lever with saidpresser-foot carrying bar and with said feeding-foot carrying bar; andspring means effective for yieldingly urging said presser-foot carryingbar and said feeding-foot carrying bar towards said work-support.

12. The combination in a sewing machine having a frame including awork-support and a bracket-arm; a reciprocatory presser-foot carryingbar; a feeding-foot carrying bar supported for endwise reciprocatory andlaterally vibratory work-feeding movements; an oscillatable lever; meansindependent of said'presser-foot carrying bar for providing a floatingfulcrum for said lever about which the latter is oscillated; means foroscillating said lever; means connecting said oscillatable lever to saidpresser-foot carrying bar and to said feeding-foot carrying bar; andspring means for yieldingly biasing said feeding-foot carrying bar andsaid presser-foot carrying bar toward said work-support.

FREDERICK F. ZEIER.

